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Indonesia terletak di pertemuan tiga lempeng tektonik utama dunia, yaitu Lempeng Eurasia, Indo-Australia dan Lempeng Pasifik, sehingga menjadi wilayah yang rawan terhadap gempa bumi tektonik. Dari hasil pengamatan terhadap kerusakan bangunan pasca gempa Lombok 2018 ditemukan bahwa kerusakan terjadi terutama karena bangunan tidak dirancang tahan gempa, mutu bahan yang tidak memadai serta detail struktur yang buruk dan bahkan kombinasi dari beberapa kondisi tadi. Dari sekian banyak kerusakan bangunan yang terjadi mayoritas adalah bangunan rumah hunian sederhana yang terbuat dari tembok bata merah atau batako, dengan atau tanpa perkuatan kerangka beton bertulangan atau konstruksi Non-Engineered. Sekolah Menengah Kejuruan (SMK) jurusan Teknik Konstruksi dan Perumahan yang merupakan bagian dari program/paket keahlian Teknologi dan Rekayasa, adalah ujung tombak pencetak calon tenaga-tenaga muda di bidang konstruksi bangunan. Keberhasilan pembangunan infrastruktur tahan gempa salahsatunya ditentukan oleh lulusan sekolah SMK yang memahami filosofi bangunan tanah gempa. Memperhatikan kurikulum pada jurusan Teknik Konstruksi dan Perumahan masih sangat terbatas menyentuh tentang kaidah bangunan sederhana tahan gempa maka telah dilakukan sosialisasi pengenalan struktur bangunan rumah sederhana tahan gempa di SMKN 3 Mataram dalam rangka implementasi SNI-1726. Sosialisasi SNI-1726 tentang Tata Cara Perencanaan Ketahanan Gempa Untuk Struktur Bangunan Gedung Dan Nongedung ini sangat penting dan mendesak dilakukan sejak dini dari bangku sekolah keteknikan mengingat permasalahan kegempaan diatas. Sosialisasi dan pengenalan bangunan tahan gempa ini dilakukan oleh tim pengajar jurusan Teknik Sipil Universitas Mataram didampingi oleh guru kelas di SMKN 3 Mataram dengan cara ceramah dan dialog di kelas. Adapun media belajar dan alat bantu digunakan berupa Pamflet dan Poster bangunan tahan gempa, LCD serta animasi pelaksanaan bangunan sederhana tahan gempa. Pada saat ceramah banyak terjadi diskusi seputar tata cara detailing tulangan beton, detailing sambungan konstruksi atap serta tata cara perbaikan konstruksi tahan gempa. Para siswa sangat antusias dalam diskusi dan mendapatkan sesuatu yang baru

The availability of land for the residential area is becoming scarce in Mataram, The capital city of West Nusa Tenggara. In response to this situation, the construction of high buildings becoming a trend. A trend that initiating a new quandary as this city is located in a high-risk area, prone to earthquakes. Still fresh in our memory, when this area was struck by a series of earthquakes in 2018, two major shocks of 7 and 6,9 magnitude were followed by thousands of aftershocks. Therefore, means are needed to mitigate the risk, for instance reinforcing the utilization of steel. Steel is known for its capacity to withhold immense quakes. Melted connecting plates and cracked connecting bolts are frequent issues in high building construction, often leading to the faulty building. Hence, educating craftsmen on steel structure connection is essential. This community service is done by training craftsmen after acquiring data regarding their capabilities. On the training day, craftsmen were taught by the community service team regarding frame connection, column beam connection, the connection of sub-beam main beam, and base plate connection. The craftsmen are given time to discuss with the community service team. The evaluation shows, there is an increase in craftsmen performance scores after receiving the training, there was an increase of 44,74 or equivalent to 112,225%.

Indonesia merupakan negara yang memiliki potensi gempa tinggi, untuk itu perlu usaha mereduksi dampak yang timbul akibat gempa terutama pada struktur bangunan. Struktur yang dianalisis adalah gedung Tempat Evakuasi Sementara (TES) yang berada di Bangsal, Lombok Utara. Gedung ini terdiri dari 4 lantai dan akan dilakukan analisis tiga dimensi pada struktur fixed base dan struktur yang menggunakan base isolator bertipe lead rubber bearing (LRB), friction pendulum system (FPS) dan high damping rubber bearing (HDRB). Berdasarkan hasil analisis didapatkan diameter isolator tipe LRB dan HDRB sebesar 750 mm, sementara diameter FPS sebesar 1180 mm. Dengan menggunakan base isolator terjadi peningkatan periode struktur untuk tipe LRB, FPS dan HDRB berturut-turut sebesar 1,812 detik; 1,957 detik dan 1,435 detik. Terjadi juga peningkatan pada simpangan dasar arah x dan y pada tipe LRB, HDRB dan FPS, yakni berturut-turut sebesar 96,42%; 96,99%; 94,15% dan 93,84%; 93,16%; 89,97%. Sementara itu, terjadi penurunan pada simpangan antar lantai arah x berturut-turut sebesar 64,2%; 63,73%, 64,7% dan arah y sebesar 60,65%; 62,61%; 56,67%. Base isolator tidak langsung menyentuh pondasi melainkan dihubungkan dengan kolom pedestal yang berdiameter 1500 mm dengan tulangan 54 D25. Sementara itu untuk menghubungkan antara isolator dengan kolom pedestal digunakan base plate dengan tebal 20 mm dan panjang baut angkur sebesar 700 mm. Hasil analisis menunjukkan penggunaan base isolator dapat secara efektif memperbaiki respon struktur terhadap bahaya gempa, pada kasus ini pada gedung berlantai 4.

considerably satisfying progress. It can be seen that most of the village roads have been paved to meet community needs in supporting economic progress and tourism. However, the Lombok island strong earthquake in 2018 damaged facilities and infrastructures because the location of Senggigi was close to the epicenter of the earthquake. One of the damages occurred at the youth organization center in Kerandangan Sub-village. The purpose of this community service is to assist in repairing the center; therefore it can operate normally. The method used is divided into several stages. The first stage is an assessment of the damage to ensure whether the center can be rehabilitated economically. The second stage is to collect data on the details of the damage. The third stage is to decide which repairs will be made and the materials to be used. The last stage is rehabilitation activities. This work was carried out in approximately two weeks with the community self-financing fee and directed by the community service team. The Senggigi Village Head has re-inaugurated the center and is expected to be used according to its previous function by the children and youth of Senggigi Village.

Currently, due to the low production of eggs in Nusa Tenggara Barat Province, most eggs on the market are brought in from other region. Despite it’s huge population, representing 24,6% population of Nusa Tenggara Barat, East Lombok could supply 2% of market demand at most. The high cost of chicken coop construction is one of the main reasons of this low production. Meanwhile, Bamboo is abundant in East Lombok, it’s thrive along Tojang River Bank. Bamboo could be use as substitute material for battery cages. Cost production of battery cages from bamboo is relatively lower than the one made from hardwood, steel, light steel, and baton. Considering accessible substitute materials at lower price are available, the cost production could be reduced. This community service is aiming for local community cognition of local bamboo as low priced material. This community service is implemented by discourse, which done by a number of survey, survey of the community service location, and discourse to give information of how to utilize local bamboo as battery cages material, size of the cages including size of individual cage, gap between column, column’s height, local bamboo as material for frame and purlin, bamboo as economy and environmental friendly material, preservation method, suitable bamboo joint model for battery cages structure. Due to COVID-19, The battery cages constructed in the community service location was evaluated through zoom meeting.

The advantages of using self-compacting concrete (SCC) are reducing the time of construction and the number of employments, reducing noise that can disturb the surrounding environment, and increasing the density of hardened concrete structural elements, automatically affecting bond strength reinforcement in SCC. The bond strength is a parameter as an essential factor affecting the behavior of reinforced concrete. In this manuscript, the Adaptive Neuro-Fuzzy Inference System (ANFIS) model was built to predict the bond strength in SCC. For showing the performance of the ANFIS model, the level of accuracy-based correlation coefficient (R2) and Root Mean Square Error (RMSE) were determined. Learning process data consists of input and output. The input in this study includes compressive strength of concrete (f'c), the diameter of steel reinforcement (db), and development of length (Ld), while the output bond strength ( ). The results of the proposed model were in good agreement with the experimental results, as evidenced by an R2 of 0.71 and an RMSE of 3.31 MPa in the testing data, indicating that the proposed ANFIS model is capable of accurately predicting steel reinforcement bond strength in SCC.

Pulau Lombok berada dekat dengan pertemuan dua lempeng besar yaitu Lempeng Hindia-Australia di bagian selatan dan lempeng Eurasia dibagian utara, serta terdapat Sesar Naik Flores yang sangat aktif, pada tahun 2018 terjadi beberapa gempa besar besar dimulai 26 Juli 2018 sebesar 6,4SR, 7SR 5 Agustus 2018, 6,2SR tanggal 9 Agustus 2019, 6,9 SR 19 Agustus 2018. Rentetan gempa bumi ini merupakan gempa transform dari Back Arc Trusht Flores yang dangkal sehingga daya rusak sangat besar. Dari rentetan gempa ini diketahui total korban jiwa mencapai 564 orang, jumlah rumah rusak mencapai 167.000, dan ribuan fasilitas umum lainnya. Kegiatan pengabdian kepada masyarakat ini bertujuan memberikan pengetahuan tentang struktur bangunan tahan gempa, pola bangunan, tata letak bangunan, bahan bangunan dari beton, stek dari kolom ke dinding, stek dari pondasi ke sloof, bahan bangunan kayu diantaranya cara penyambungan dari baut dan paku cara takikannya, penyokongnya. Begitu juga dalam perbaikan memberikan pengetahuan metode yang cepat tidak perlu pengawasan yang berlebihan, bahan lokal yang murah. Pengabdian ini dinyatakan berhasil ditinjau dari aspek afektif dan kognitif, peserta penyuluhan telah memahami pentingnya bangunan tahan gempa. Sedangkan dari aspek psikomotorik, Tim Penyuluh belum dapat memantau perubahan perilaku terhadap sistem perencanaan bangunan tahan gempa yang terjadi pada peserta penyuluhan, mengingat terbatasnya waktu dan minimnya dana penyuluhan. Masyarakat kurang memiliki motivasi karena kurangnya keahlian dalam teknik perencanaan pembangunan tahan gempa dan kurang teraturnya sector pembangunan. Untuk itu perlu dilakukan pemantauan yang berlanjut dan berkesinambungan.

Concrete is a building material that is widely used in the construction industry. With the increasing need for concrete, the demand for constituent materials will increase. To reduce dependence on natural materials, the recycling process of the concrete waste has been encouraged recently. This study applied a heating and grinding method of waste concrete to obtain higher quality recycled coarse aggregate. The addition of vibrations in the mixing process is aimed to enhance the recycled concrete compressive strength. To produce recycled coarse aggregate, the concrete waste was heated to a temperature of 100°C for 24 hours followed by a grinding process using a Los Angeles machine for 600 cycles. Additional vibrations for 30, 60, and 90 were applied in a concrete mixer during the mixing process. Conventional concrete with normal aggregate and no additional vibration during mixing was also provided for comparison. According to the experimental results, the quality of natural coarse aggregate and the recycled one using heating and grinding methods is not much different. Compressive strength of recycled aggregate concrete with vibrations of 30, 60, and 90 seconds increases 21.1%, 22.1%, and 22.6% sequentially correlated to normal concrete. Recycled concrete using heating and grinding methods with the addition of vibration during the mixing process is effective to be used as an alternative to normal coarse aggregate.

Utilization of timber and bamboo as building materials was very promising for now and future. As renewable resources they have high mechanical properties, lightweight, environmentally friendly and economic. Utilization of bamboo as connector was rarely published. Therefore, this study focused on utilization of non-metal material as connector in timber structure especially for beam and column. This research was conducted in the laboratory to examine the strength of double shear timber connection by using glued in rods (bamboo dowel) as connector with variation of adhesive thickness. As control specimen was used bamboo dowel O14 mm without adhesive in double shear connection. The results showed that the strength of double shear timber connection by using glued in rods (bamboo dowel) as connector could increased by 41% to resist axial force higher than the control one.

Recently, the utilization of timber as building materials was very promising for now and future. As renewable resources they have high mechanical properties, lightweight, environmentally friendly and economic. One of the most durable engineered wood products is glued-laminated timber which commonly called Glulam. Glulam is a material made of several layers of wood glued together with waterproof adhesive at specific pressure and temperature. The benefit of Glulam is enable to produce the structural member with longer span compared with solid wood. In other to obtain the structural Glulam with longer span, it required the finger joint connection on lamina layer. This study aims at to find out the effectiveness finger joint with variation in wood species towards flexural properties of Glulam beam. Experimental study have been done by using local wood Sengon and Rajumas as laminae and Biomatex as adhesive, at 0.6 MPa of clamp pressure. The variation of finger joint slope was tested are 1:8; 1:12; and 1:16. The result show that the glulam Sengon and Rajumas beam with slope finger joint of 1 over 12 produce the highest average bending strength of 299 kg/cm2 and 318 kg/cm2 respectively. The flexural strength of glulam Rajumas was 20% higher compared with glulam Sengon.