Seismic Certification of Container Houses
The seismic performance of container houses varies depending on their design, structure, materials, and manufacturers. Some products can achieve a seismic intensity of 8, meeting the requirements of relevant national building seismic design codes. The following analysis is conducted from different dimensions:
I. Measured Data of Enterprise Products
The packing-box units of Suzhou Zhongnan Steel Structure Co., Ltd. adopt a full steel structure frame and have a measured seismic intensity of 8, fully complying with the requirements of the GB50011-2010 (2016 edition) building seismic design code. During tests in the seismic zone of the southwestern mountainous region, there was no deformation at the frame connections, and the wall-mounted color steel plates fit tightly, indicating excellent structural stability and seismic performance. The packing-box units of CIMC Modular Building Investment Co., Ltd. have a seismic intensity of 7.5, while those of Yazhi Integrated Housing Co., Ltd. and Hangzhou Xiaoya Integrated Housing Co., Ltd. have a seismic intensity of 7. Although slightly lower than the former, they can still meet the basic needs of most earthquake-prone areas.
II. Impact of Structural Design and Materials
The seismic performance of container houses mainly depends on the strength of the steel structure frame and the reliability of the connection nodes. For example, standard container units adopt steel structure frames of international standard sizes, which can withstand an earthquake of magnitude 8 and have a service life of over 70 years. Studies on multi-story modular box-type houses have shown that by optimizing connection nodes (such as designing 'X-shaped' clip nodes) and adopting embedded composite beam-column systems, the overall seismic performance can be significantly improved, enabling some structures to meet the design requirements for minor earthquakes of magnitude 9.
III. Verification of Extreme Environment Adaptability
In seismic simulation tests, the performance of products from different enterprises varies significantly. For example, the lightweight steel structure houses of Hangzhou Xiaoya Integrated Housing Co., Ltd. showed significant displacement of internal office furniture during tests, requiring additional fixed brackets to be installed. This reflects that seismic design needs to take into account the stability of both the structure and internal facilities. The products of Chengdong Housing have been verified through ultimate bearing capacity tests to withstand an earthquake intensity of 8, and the lightweight steel structures exhibit better toughness during earthquakes, effectively reducing the degree of damage.
IV. Industry Norms and Certification Requirements
The seismic performance of container houses must comply with national or industry standards. For example, the GB50011-2010 code sets clear requirements for building seismic design, and some enterprise products have passed third-party inspections and obtained authoritative certifications. In addition, environmental protection certifications (such as the T/CCMSA 20108—2019 standard) and government-recognized certification results further regulate market behavior and provide users with performance assurance.
